This map is more fully known as the City of Pittsburgh Zoning Map adopted July 1923 and amended through August 1927. In 1926, Pittsburgh adopted its first exclusively single-family zoning district. The 1927 zoning map is the earliest existing map after this amendment. From 1923-1958, Pittsburgh mapped uses, area, and height as three different layers each with its own boundaries. In 1927, there were 6 use districts, 5 area districts, and 5 height districts. In this digitization, these three layers are collapsed to create zones more readily comparable to the modern approach where each zoning district has its own distinct regulations for use, area, and height. With this flattening, there are 54 distinct districts. The data table identifies the zoning district (aka use district), height district, and area district as well as a combined district based on the short names of the individual districts. Details Reviewed created this map based on the original paper map available in the Pittsburgh Zoning Office. The digitization was funded by the Pennsylvania Housing Agency's Kathy A. Possinger Housing Policy Fellowship and the Heinz Endowments.